永宁河四级水电站1#引水隧洞塌方段临时支护施工

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根据永宁河四级电站1#引水隧洞下游塌方特殊地质段,对两次塌方段采用的洞挖支护的处理方案,取得了安全有效的支护效果,对今后隧洞施工类似的V类塌方段围岩取得了处理施工经验。
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